Improvement in cultivator-teeth



D. B. ROGERS.

Cultivator-Teeth.

Patented May 8. 1860.

AM.PHOT0U1'H0. C0. N.Y. (OSBUINE'S PROCESS) UNITED STATES PATENT OFFICE.

DAVID B. ROGERS, OF PIT'ISBURG, PENNSYLVANIA.

IM PROVEM E N'T IN CULTlVATOR-TEETH.

Specification forming part of Letters Patent No. 28,198, dated May 8, 1860.

To all whom it may concern Be it known that I, DAVID B. ROGERS, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Cultivator-Teeth; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the annexed drawings, forming part of this specification, in which- Figure 1 is a representation of the shape of a plate of steel from which I form my improved teeth. Fig. 2 represents the shape of the bolt which I use for fastening myimproved tooth to the frame. Fig. 3 represents my improved cultivator-tooth when finished and ready for insertion into the beam of the cultivator-frame. Fig. 4 represents my improved cultivator-tooth as attached to the frame.

In the several figures, like letters denote similar parts.

My im proved cultivator-teeth are constructed each of a single plate of steel curved round in front to give stiffness and strength to the tooth, and thus enable it to be made of thin platesteel, substantially as described in Letters Patent granted to me on the 1st day of November, A. D. 1845, and extended for the term of seven years from the 1st day of November, A. D. 1859. My mode of attaching the tooth to the frame, as described in the specification accompanying said patent, consists in passing the upper end of the cultivator-tooth, which is curved round in front, up into a suitablyshaped slot in the beam of the cultivator, and then driving a wedge down into the cavity of the tooth, thus pressing it out against the'walls of the hole or slot through which it was inserted, and holding it firmly in place. I

My present invention consists in an improve ment in the construction of the upper part of the shank of the tooth, whereby the tooth may be more conveniently attached to the frame, and, instead of inserting the whole depth of steel into the hole in the beam, I wrap the curved front portion of the top of the shank around a bolt, which projects upward above the top of the shank, and is furnished with a nut and washer to screw down on the top of the beam, and the steel plate back of that part which is bent around the bolt I bend square down, so as to form a shoulder, except the extreme corners, which are turned up straight,

and coming together form a stay-point, which is forced into the wooden beam, and prevents the tooth turning on its round shank.

To enable others skilled in the art to make and use my improved cultivator-tooth, I will proceed to describe its construction and operation. 1

I use thin plate-steel for making my cultivator-teetlnthe entire tooth being made of one piece, which is cut out into a fiat piece of the shape shown in Fig.1 by suitable dies. Instead of the top of my tooth being a straight unbroken line, as represented in my patent already referred to, I cut out a triangular piece at each corner, as shown in Fig. 1, leaving a rectangular flap, a, in the center at the top of the plate. The depth of this flap a is not quite as great as the depth of the beam to which the teeth are to be attached, and the width of the flap. is about twice the diameter of the bolt 11, used in attaching the tooth to the beam, or a little more, so that when the flap is wrapped around the bolt it may have a good hold on it. The pieces of steel cutout of the upper end of the shank on each side ofthe flap a leave two triangular corner-pieces, o c, at the top of the tooth, the points of the triangles being on the upper outer corner of the plate, as seen in Fig. 1. The corner-pieces c o are then bent down backward at right angles to the plane surface of the steel plate, the line of bending being straight across the tooth at the base of the flap a. The extreme corners,i z, of the corner-pieces e 0 are then turned up parallel to the plane of the steel plate. The red dotted lines in Fig. 1 show where the plate is bent, as just described. The steel plate having the upper end thus shaped is then placed between dies which give it the required shape of foot and shank, curving it round in front, as shown in Fig. 3. At the same time the upper part or flap, a, is bent around the bolt 1), the head dof which isjust below the base of the flaps, so that the turned-down corners c 0 (when the tooth is bent round) form a square shoulder, against the under side of which the head dof the'bolt rests, so that it cannot be pulled through. The flap a, being hot when bent round the bolt, shrinks around it in cooling and hugs it very firmly; but, if preferred, it may be welded to the bolt. When the tooth is thus bent round the two pointst' t', or extreme corners of the cornerpieces 0 0, come together and form a stay- I point, z. .(Seen in Fig.3.) A screw is cut on the upper end of the bolt b to receive the nut and a washer. f, under the bolt rests on the surface of the beam when the tooth is in place.

Thus constructed, the tooth is attached to the beam simply by passing the upper end of the shank around which the bolt is wrapped through a round hole bored in the beam 9 until the shoulder formed by the corner-pieces c 0 rests against the under side of the beam. The stay-point i which is at the rear end of the shoulder is driven intothe beam and efi'ectually secures the tooth from turning. The flappiece of steel a does not reach to the top of the beam, but the extremity of the bolt-projects above the upper surface of th'e'beain g, and the nut e is screwed tightly down, thusdrawing up the tooth and securing it firmlyin place, as seen in Fig. 4.

Having thus described my improvement, I do not claim the use of a bolt for attaching the tooth to thebeam of the cultivator in itself considered nor do I claim passing the curved end of the shank of the tooth through a hole in the beam for securing it thereto, as that is described in the specification of my patent of 1st of November, 1845; but

What I do claim as my invention, and desire to secure by Letters Patent, is

Attaching the bolt by which the tooth is secured to the beam to the shank of the tooth by wrapping the shank around it and passing a portion of the shank together with the bolt into the beam, in combination with the shoulder and stay-point formed out of the upper end of the shank, substantially in the manner described, for the purpose of attaching the tooth to the beam of a cultivator.

In testimony whereof the said DAVID B. ROGERS hath hereunto set his hand in presence of us.

D. B. ROGERS.

Witnesses:

MARTI G. CUSHING, W. BAKEWELL. 

